What is a function of the Layer 4 Traffic Monitor on a Cisco WSA?

Blocking traffic from malicious URL categories is a function of URL filtering, which is separate from the Layer 4 Traffic Monitor's primary role.

Decrypting SSL traffic to monitor for malicious content is a function of SSL decryption (HTTPS inspection), which operates at a higher application layer.

The Layer 4 Traffic Monitor on a Cisco Web Security Appliance (WSA) is designed to monitor non-web (non-HTTP/HTTPS) traffic across all TCP and UDP ports. It identifies suspicious or anomalous activity by looking at connection characteristics, helping to detect malware communicating on non-standard ports or command-and-control channels.

Preventing data exfiltration by searching for sensitive information is a function of Data Loss Prevention (DLP), not the primary role of the Layer 4 Traffic Monitor.